package cn.javaguide.collection;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.CopyOnWriteArrayList;

public class Train {
    public static void main(String[] args) {

        ConcurrentHashMap cchm = new ConcurrentHashMap();

        CopyOnWriteArrayList copyOnWriteArrayList = new CopyOnWriteArrayList();

        ConcurrentSkipListMap concurrentSkipListMap = new ConcurrentSkipListMap();

    }
}
